inet_diag.c 22.5 KB
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/*
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 * inet_diag.c	Module for monitoring INET transport protocols sockets.
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 *
 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 *	This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

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#include <linux/kernel.h>
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#include <linux/module.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/random.h>
#include <linux/cache.h>
#include <linux/init.h>
#include <linux/time.h>

#include <net/icmp.h>
#include <net/tcp.h>
#include <net/ipv6.h>
#include <net/inet_common.h>
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#include <net/inet_connection_sock.h>
#include <net/inet_hashtables.h>
#include <net/inet_timewait_sock.h>
#include <net/inet6_hashtables.h>
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#include <net/netlink.h>
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#include <linux/inet.h>
#include <linux/stddef.h>

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#include <linux/inet_diag.h>
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static const struct inet_diag_handler **inet_diag_table;

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struct inet_diag_entry {
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	__be32 *saddr;
	__be32 *daddr;
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	u16 sport;
	u16 dport;
	u16 family;
	u16 userlocks;
};

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static struct sock *idiagnl;
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#define INET_DIAG_PUT(skb, attrtype, attrlen) \
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	RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
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static DEFINE_MUTEX(inet_diag_table_mutex);

static const struct inet_diag_handler *inet_diag_lock_handler(int type)
{
	if (!inet_diag_table[type])
		request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
			       NETLINK_INET_DIAG, type);

	mutex_lock(&inet_diag_table_mutex);
	if (!inet_diag_table[type])
		return ERR_PTR(-ENOENT);

	return inet_diag_table[type];
}

static inline void inet_diag_unlock_handler(
	const struct inet_diag_handler *handler)
{
	mutex_unlock(&inet_diag_table_mutex);
}

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static int inet_csk_diag_fill(struct sock *sk,
			      struct sk_buff *skb,
			      int ext, u32 pid, u32 seq, u16 nlmsg_flags,
			      const struct nlmsghdr *unlh)
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{
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	const struct inet_sock *inet = inet_sk(sk);
	const struct inet_connection_sock *icsk = inet_csk(sk);
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	struct inet_diag_msg *r;
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	struct nlmsghdr  *nlh;
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	void *info = NULL;
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	struct inet_diag_meminfo  *minfo = NULL;
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	unsigned char	 *b = skb_tail_pointer(skb);
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	const struct inet_diag_handler *handler;

	handler = inet_diag_table[unlh->nlmsg_type];
	BUG_ON(handler == NULL);
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	nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
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	nlh->nlmsg_flags = nlmsg_flags;
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	r = NLMSG_DATA(nlh);
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	BUG_ON(sk->sk_state == TCP_TIME_WAIT);

	if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
		minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));

	if (ext & (1 << (INET_DIAG_INFO - 1)))
		info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
				     handler->idiag_info_size);

	if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
		const size_t len = strlen(icsk->icsk_ca_ops->name);

		strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
		       icsk->icsk_ca_ops->name);
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	}
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	r->idiag_family = sk->sk_family;
	r->idiag_state = sk->sk_state;
	r->idiag_timer = 0;
	r->idiag_retrans = 0;
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	r->id.idiag_if = sk->sk_bound_dev_if;
	r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
	r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
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	r->id.idiag_sport = inet->sport;
	r->id.idiag_dport = inet->dport;
	r->id.idiag_src[0] = inet->rcv_saddr;
	r->id.idiag_dst[0] = inet->daddr;
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#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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	if (r->idiag_family == AF_INET6) {
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		struct ipv6_pinfo *np = inet6_sk(sk);

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		ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
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			       &np->rcv_saddr);
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		ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
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			       &np->daddr);
	}
#endif

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#define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
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	if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
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		r->idiag_timer = 1;
		r->idiag_retrans = icsk->icsk_retransmits;
		r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
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	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
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		r->idiag_timer = 4;
		r->idiag_retrans = icsk->icsk_probes_out;
		r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
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	} else if (timer_pending(&sk->sk_timer)) {
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		r->idiag_timer = 2;
		r->idiag_retrans = icsk->icsk_probes_out;
		r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
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	} else {
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		r->idiag_timer = 0;
		r->idiag_expires = 0;
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	}
#undef EXPIRES_IN_MS
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	r->idiag_uid = sock_i_uid(sk);
	r->idiag_inode = sock_i_ino(sk);
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	if (minfo) {
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		minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc);
		minfo->idiag_wmem = sk->sk_wmem_queued;
		minfo->idiag_fmem = sk->sk_forward_alloc;
		minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc);
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	}

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	handler->idiag_get_info(sk, r, info);
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	if (sk->sk_state < TCP_TIME_WAIT &&
	    icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
		icsk->icsk_ca_ops->get_info(sk, ext, skb);
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	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
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	return skb->len;

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rtattr_failure:
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nlmsg_failure:
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	nlmsg_trim(skb, b);
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	return -EMSGSIZE;
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}

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static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
			       struct sk_buff *skb, int ext, u32 pid,
			       u32 seq, u16 nlmsg_flags,
			       const struct nlmsghdr *unlh)
{
	long tmo;
	struct inet_diag_msg *r;
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	const unsigned char *previous_tail = skb_tail_pointer(skb);
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	struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
					 unlh->nlmsg_type, sizeof(*r));

	r = NLMSG_DATA(nlh);
	BUG_ON(tw->tw_state != TCP_TIME_WAIT);

	nlh->nlmsg_flags = nlmsg_flags;

	tmo = tw->tw_ttd - jiffies;
	if (tmo < 0)
		tmo = 0;

	r->idiag_family	      = tw->tw_family;
	r->idiag_state	      = tw->tw_state;
	r->idiag_timer	      = 0;
	r->idiag_retrans      = 0;
	r->id.idiag_if	      = tw->tw_bound_dev_if;
	r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
	r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
	r->id.idiag_sport     = tw->tw_sport;
	r->id.idiag_dport     = tw->tw_dport;
	r->id.idiag_src[0]    = tw->tw_rcv_saddr;
	r->id.idiag_dst[0]    = tw->tw_daddr;
	r->idiag_state	      = tw->tw_substate;
	r->idiag_timer	      = 3;
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	r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
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	r->idiag_rqueue	      = 0;
	r->idiag_wqueue	      = 0;
	r->idiag_uid	      = 0;
	r->idiag_inode	      = 0;
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
	if (tw->tw_family == AF_INET6) {
		const struct inet6_timewait_sock *tw6 =
						inet6_twsk((struct sock *)tw);

		ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
			       &tw6->tw_v6_rcv_saddr);
		ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
			       &tw6->tw_v6_daddr);
	}
#endif
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	nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
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	return skb->len;
nlmsg_failure:
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	nlmsg_trim(skb, previous_tail);
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	return -EMSGSIZE;
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}

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static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
			int ext, u32 pid, u32 seq, u16 nlmsg_flags,
			const struct nlmsghdr *unlh)
{
	if (sk->sk_state == TCP_TIME_WAIT)
		return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
					   skb, ext, pid, seq, nlmsg_flags,
					   unlh);
	return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
}

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static int inet_diag_get_exact(struct sk_buff *in_skb,
			       const struct nlmsghdr *nlh)
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{
	int err;
	struct sock *sk;
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	struct inet_diag_req *req = NLMSG_DATA(nlh);
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	struct sk_buff *rep;
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	struct inet_hashinfo *hashinfo;
	const struct inet_diag_handler *handler;

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	handler = inet_diag_lock_handler(nlh->nlmsg_type);
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	if (IS_ERR(handler)) {
		err = PTR_ERR(handler);
		goto unlock;
	}
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	hashinfo = handler->idiag_hashinfo;
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	err = -EINVAL;
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	if (req->idiag_family == AF_INET) {
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		sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
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				 req->id.idiag_dport, req->id.idiag_src[0],
				 req->id.idiag_sport, req->id.idiag_if);
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	}
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#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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	else if (req->idiag_family == AF_INET6) {
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		sk = inet6_lookup(&init_net, hashinfo,
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				  (struct in6_addr *)req->id.idiag_dst,
				  req->id.idiag_dport,
				  (struct in6_addr *)req->id.idiag_src,
				  req->id.idiag_sport,
				  req->id.idiag_if);
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	}
#endif
	else {
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		goto unlock;
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	}

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	err = -ENOENT;
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	if (sk == NULL)
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		goto unlock;
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	err = -ESTALE;
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	if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
	     req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
	    ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
	     (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
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		goto out;

	err = -ENOMEM;
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	rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
				     sizeof(struct inet_diag_meminfo) +
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				     handler->idiag_info_size + 64)),
			GFP_KERNEL);
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	if (!rep)
		goto out;

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	err = sk_diag_fill(sk, rep, req->idiag_ext,
			   NETLINK_CB(in_skb).pid,
			   nlh->nlmsg_seq, 0, nlh);
	if (err < 0) {
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(rep);
		goto out;
	}
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	err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
			      MSG_DONTWAIT);
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	if (err > 0)
		err = 0;

out:
	if (sk) {
		if (sk->sk_state == TCP_TIME_WAIT)
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			inet_twsk_put((struct inet_timewait_sock *)sk);
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		else
			sock_put(sk);
	}
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unlock:
	inet_diag_unlock_handler(handler);
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	return err;
}

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static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
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{
	int words = bits >> 5;

	bits &= 0x1f;

	if (words) {
		if (memcmp(a1, a2, words << 2))
			return 0;
	}
	if (bits) {
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		__be32 w1, w2;
		__be32 mask;
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		w1 = a1[words];
		w2 = a2[words];

		mask = htonl((0xffffffff) << (32 - bits));

		if ((w1 ^ w2) & mask)
			return 0;
	}

	return 1;
}


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static int inet_diag_bc_run(const void *bc, int len,
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			    const struct inet_diag_entry *entry)
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{
	while (len > 0) {
		int yes = 1;
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		const struct inet_diag_bc_op *op = bc;
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		switch (op->code) {
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		case INET_DIAG_BC_NOP:
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			break;
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		case INET_DIAG_BC_JMP:
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			yes = 0;
			break;
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		case INET_DIAG_BC_S_GE:
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			yes = entry->sport >= op[1].no;
			break;
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		case INET_DIAG_BC_S_LE:
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			yes = entry->dport <= op[1].no;
			break;
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		case INET_DIAG_BC_D_GE:
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			yes = entry->dport >= op[1].no;
			break;
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		case INET_DIAG_BC_D_LE:
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			yes = entry->dport <= op[1].no;
			break;
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		case INET_DIAG_BC_AUTO:
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			yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
			break;
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		case INET_DIAG_BC_S_COND:
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		case INET_DIAG_BC_D_COND: {
			struct inet_diag_hostcond *cond;
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			__be32 *addr;
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			cond = (struct inet_diag_hostcond *)(op + 1);
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			if (cond->port != -1 &&
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			    cond->port != (op->code == INET_DIAG_BC_S_COND ?
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					     entry->sport : entry->dport)) {
				yes = 0;
				break;
			}
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			if (cond->prefix_len == 0)
				break;

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			if (op->code == INET_DIAG_BC_S_COND)
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				addr = entry->saddr;
			else
				addr = entry->daddr;

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			if (bitstring_match(addr, cond->addr,
					    cond->prefix_len))
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				break;
			if (entry->family == AF_INET6 &&
			    cond->family == AF_INET) {
				if (addr[0] == 0 && addr[1] == 0 &&
				    addr[2] == htonl(0xffff) &&
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				    bitstring_match(addr + 3, cond->addr,
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						    cond->prefix_len))
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					break;
			}
			yes = 0;
			break;
		}
		}

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		if (yes) {
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			len -= op->yes;
			bc += op->yes;
		} else {
			len -= op->no;
			bc += op->no;
		}
	}
	return (len == 0);
}

static int valid_cc(const void *bc, int len, int cc)
{
	while (len >= 0) {
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		const struct inet_diag_bc_op *op = bc;
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		if (cc > len)
			return 0;
		if (cc == len)
			return 1;
		if (op->yes < 4)
			return 0;
		len -= op->yes;
		bc  += op->yes;
	}
	return 0;
}

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static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
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{
	const unsigned char *bc = bytecode;
	int  len = bytecode_len;

	while (len > 0) {
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		struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
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//printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
		switch (op->code) {
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		case INET_DIAG_BC_AUTO:
		case INET_DIAG_BC_S_COND:
		case INET_DIAG_BC_D_COND:
		case INET_DIAG_BC_S_GE:
		case INET_DIAG_BC_S_LE:
		case INET_DIAG_BC_D_GE:
		case INET_DIAG_BC_D_LE:
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			if (op->yes < 4 || op->yes > len + 4)
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				return -EINVAL;
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		case INET_DIAG_BC_JMP:
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			if (op->no < 4 || op->no > len + 4)
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				return -EINVAL;
			if (op->no < len &&
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			    !valid_cc(bytecode, bytecode_len, len - op->no))
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				return -EINVAL;
			break;
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		case INET_DIAG_BC_NOP:
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			if (op->yes < 4 || op->yes > len + 4)
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				return -EINVAL;
			break;
		default:
			return -EINVAL;
		}
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		bc  += op->yes;
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		len -= op->yes;
	}
	return len == 0 ? 0 : -EINVAL;
}

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static int inet_csk_diag_dump(struct sock *sk,
			      struct sk_buff *skb,
			      struct netlink_callback *cb)
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{
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	struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
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	if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
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		struct inet_diag_entry entry;
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		struct rtattr *bc = (struct rtattr *)(r + 1);
		struct inet_sock *inet = inet_sk(sk);

		entry.family = sk->sk_family;
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#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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		if (entry.family == AF_INET6) {
			struct ipv6_pinfo *np = inet6_sk(sk);

			entry.saddr = np->rcv_saddr.s6_addr32;
			entry.daddr = np->daddr.s6_addr32;
		} else
#endif
		{
			entry.saddr = &inet->rcv_saddr;
			entry.daddr = &inet->daddr;
		}
		entry.sport = inet->num;
		entry.dport = ntohs(inet->dport);
		entry.userlocks = sk->sk_userlocks;

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		if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
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			return 0;
	}

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	return inet_csk_diag_fill(sk, skb, r->idiag_ext,
				  NETLINK_CB(cb->skb).pid,
				  cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
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}

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static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
			       struct sk_buff *skb,
			       struct netlink_callback *cb)
{
	struct inet_diag_req *r = NLMSG_DATA(cb->nlh);

	if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
		struct inet_diag_entry entry;
		struct rtattr *bc = (struct rtattr *)(r + 1);

		entry.family = tw->tw_family;
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
		if (tw->tw_family == AF_INET6) {
			struct inet6_timewait_sock *tw6 =
						inet6_twsk((struct sock *)tw);
			entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
			entry.daddr = tw6->tw_v6_daddr.s6_addr32;
		} else
#endif
		{
			entry.saddr = &tw->tw_rcv_saddr;
			entry.daddr = &tw->tw_daddr;
		}
		entry.sport = tw->tw_num;
		entry.dport = ntohs(tw->tw_dport);
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		entry.userlocks = 0;
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		if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
			return 0;
	}

	return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
				   NETLINK_CB(cb->skb).pid,
				   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
}

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static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
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			      struct request_sock *req, u32 pid, u32 seq,
			      const struct nlmsghdr *unlh)
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{
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	const struct inet_request_sock *ireq = inet_rsk(req);
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	struct inet_sock *inet = inet_sk(sk);
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	unsigned char *b = skb_tail_pointer(skb);
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	struct inet_diag_msg *r;
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	struct nlmsghdr *nlh;
	long tmo;

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	nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
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	nlh->nlmsg_flags = NLM_F_MULTI;
	r = NLMSG_DATA(nlh);

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	r->idiag_family = sk->sk_family;
	r->idiag_state = TCP_SYN_RECV;
	r->idiag_timer = 1;
	r->idiag_retrans = req->retrans;
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	r->id.idiag_if = sk->sk_bound_dev_if;
	r->id.idiag_cookie[0] = (u32)(unsigned long)req;
	r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
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	tmo = req->expires - jiffies;
	if (tmo < 0)
		tmo = 0;

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	r->id.idiag_sport = inet->sport;
	r->id.idiag_dport = ireq->rmt_port;
	r->id.idiag_src[0] = ireq->loc_addr;
	r->id.idiag_dst[0] = ireq->rmt_addr;
	r->idiag_expires = jiffies_to_msecs(tmo);
	r->idiag_rqueue = 0;
	r->idiag_wqueue = 0;
	r->idiag_uid = sock_i_uid(sk);
	r->idiag_inode = 0;
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#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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	if (r->idiag_family == AF_INET6) {
		ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
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			       &inet6_rsk(req)->loc_addr);
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		ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
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			       &inet6_rsk(req)->rmt_addr);
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	}
#endif
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	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
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	return skb->len;

nlmsg_failure:
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	nlmsg_trim(skb, b);
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	return -1;
}

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static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
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			       struct netlink_callback *cb)
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{
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	struct inet_diag_entry entry;
	struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
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	struct inet_connection_sock *icsk = inet_csk(sk);
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	struct listen_sock *lopt;
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	struct rtattr *bc = NULL;
	struct inet_sock *inet = inet_sk(sk);
	int j, s_j;
	int reqnum, s_reqnum;
	int err = 0;

	s_j = cb->args[3];
	s_reqnum = cb->args[4];

	if (s_j > 0)
		s_j--;

	entry.family = sk->sk_family;

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	read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
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	lopt = icsk->icsk_accept_queue.listen_opt;
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	if (!lopt || !lopt->qlen)
		goto out;

	if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
		bc = (struct rtattr *)(r + 1);
		entry.sport = inet->num;
		entry.userlocks = sk->sk_userlocks;
	}

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	for (j = s_j; j < lopt->nr_table_entries; j++) {
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		struct request_sock *req, *head = lopt->syn_table[j];
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		reqnum = 0;
		for (req = head; req; reqnum++, req = req->dl_next) {
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			struct inet_request_sock *ireq = inet_rsk(req);

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			if (reqnum < s_reqnum)
				continue;
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			if (r->id.idiag_dport != ireq->rmt_port &&
			    r->id.idiag_dport)
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				continue;

			if (bc) {
				entry.saddr =
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#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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					(entry.family == AF_INET6) ?
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					inet6_rsk(req)->loc_addr.s6_addr32 :
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#endif
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					&ireq->loc_addr;
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				entry.daddr =
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#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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					(entry.family == AF_INET6) ?
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					inet6_rsk(req)->rmt_addr.s6_addr32 :
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#endif
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					&ireq->rmt_addr;
				entry.dport = ntohs(ireq->rmt_port);
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				if (!inet_diag_bc_run(RTA_DATA(bc),
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						    RTA_PAYLOAD(bc), &entry))
					continue;
			}

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			err = inet_diag_fill_req(skb, sk, req,
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					       NETLINK_CB(cb->skb).pid,
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					       cb->nlh->nlmsg_seq, cb->nlh);
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			if (err < 0) {
				cb->args[3] = j + 1;
				cb->args[4] = reqnum;
				goto out;
			}
		}

		s_reqnum = 0;
	}

out:
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	read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
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	return err;
}

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static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
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{
	int i, num;
	int s_i, s_num;
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	struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
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	const struct inet_diag_handler *handler;
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	struct inet_hashinfo *hashinfo;
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	handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
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	if (IS_ERR(handler))
		goto unlock;
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	hashinfo = handler->idiag_hashinfo;
713

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	s_i = cb->args[1];
	s_num = num = cb->args[2];
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	if (cb->args[0] == 0) {
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		if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
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			goto skip_listen_ht;
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		for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
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			struct sock *sk;
			struct hlist_node *node;
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			struct inet_listen_hashbucket *ilb;
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			num = 0;
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			ilb = &hashinfo->listening_hash[i];
			spin_lock_bh(&ilb->lock);
			sk_for_each(sk, node, &ilb->head) {
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				struct inet_sock *inet = inet_sk(sk);

				if (num < s_num) {
					num++;
					continue;
				}

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				if (r->id.idiag_sport != inet->sport &&
				    r->id.idiag_sport)
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					goto next_listen;

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				if (!(r->idiag_states & TCPF_LISTEN) ||
				    r->id.idiag_dport ||
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				    cb->args[3] > 0)
					goto syn_recv;

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				if (inet_csk_diag_dump(sk, skb, cb) < 0) {
747
					spin_unlock_bh(&ilb->lock);
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					goto done;
				}

syn_recv:
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				if (!(r->idiag_states & TCPF_SYN_RECV))
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					goto next_listen;

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				if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
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					spin_unlock_bh(&ilb->lock);
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					goto done;
				}

next_listen:
				cb->args[3] = 0;
				cb->args[4] = 0;
				++num;
			}
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			spin_unlock_bh(&ilb->lock);
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			s_num = 0;
			cb->args[3] = 0;
			cb->args[4] = 0;
		}
skip_listen_ht:
		cb->args[0] = 1;
		s_i = num = s_num = 0;
	}

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	if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
777
		goto unlock;
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	for (i = s_i; i < hashinfo->ehash_size; i++) {
		struct inet_ehash_bucket *head = &hashinfo->ehash[i];
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		spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
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		struct sock *sk;
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		struct hlist_nulls_node *node;
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		num = 0;

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		if (hlist_nulls_empty(&head->chain) &&
			hlist_nulls_empty(&head->twchain))
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			continue;

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		if (i > s_i)
			s_num = 0;

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		spin_lock_bh(lock);
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		sk_nulls_for_each(sk, node, &head->chain) {
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			struct inet_sock *inet = inet_sk(sk);

			if (num < s_num)
				goto next_normal;
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			if (!(r->idiag_states & (1 << sk->sk_state)))
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				goto next_normal;
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			if (r->id.idiag_sport != inet->sport &&
			    r->id.idiag_sport)
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				goto next_normal;
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			if (r->id.idiag_dport != inet->dport &&
			    r->id.idiag_dport)
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				goto next_normal;
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			if (inet_csk_diag_dump(sk, skb, cb) < 0) {
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				spin_unlock_bh(lock);
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				goto done;
			}
next_normal:
			++num;
		}

816
		if (r->idiag_states & TCPF_TIME_WAIT) {
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			struct inet_timewait_sock *tw;

			inet_twsk_for_each(tw, node,
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				    &head->twchain) {
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				if (num < s_num)
					goto next_dying;
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				if (r->id.idiag_sport != tw->tw_sport &&
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				    r->id.idiag_sport)
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					goto next_dying;
827
				if (r->id.idiag_dport != tw->tw_dport &&
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				    r->id.idiag_dport)
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					goto next_dying;
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				if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
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					spin_unlock_bh(lock);
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					goto done;
				}
next_dying:
				++num;
			}
		}
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		spin_unlock_bh(lock);
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	}

done:
	cb->args[1] = i;
	cb->args[2] = num;
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unlock:
	inet_diag_unlock_handler(handler);
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	return skb->len;
}

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static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
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{
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	int hdrlen = sizeof(struct inet_diag_req);
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	if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
	    nlmsg_len(nlh) < hdrlen)
		return -EINVAL;
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	if (nlh->nlmsg_flags & NLM_F_DUMP) {
		if (nlmsg_attrlen(nlh, hdrlen)) {
			struct nlattr *attr;
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			attr = nlmsg_find_attr(nlh, hdrlen,
					       INET_DIAG_REQ_BYTECODE);
			if (attr == NULL ||
			    nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
			    inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
				return -EINVAL;
		}
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		return netlink_dump_start(idiagnl, skb, nlh,
					  inet_diag_dump, NULL);
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	}
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	return inet_diag_get_exact(skb, nlh);
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}

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static DEFINE_MUTEX(inet_diag_mutex);

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static void inet_diag_rcv(struct sk_buff *skb)
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{
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	mutex_lock(&inet_diag_mutex);
	netlink_rcv_skb(skb, &inet_diag_rcv_msg);
	mutex_unlock(&inet_diag_mutex);
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}

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int inet_diag_register(const struct inet_diag_handler *h)
{
	const __u16 type = h->idiag_type;
	int err = -EINVAL;

	if (type >= INET_DIAG_GETSOCK_MAX)
		goto out;

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	mutex_lock(&inet_diag_table_mutex);
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	err = -EEXIST;
	if (inet_diag_table[type] == NULL) {
		inet_diag_table[type] = h;
		err = 0;
	}
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	mutex_unlock(&inet_diag_table_mutex);
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out:
	return err;
}
EXPORT_SYMBOL_GPL(inet_diag_register);

void inet_diag_unregister(const struct inet_diag_handler *h)
{
	const __u16 type = h->idiag_type;

	if (type >= INET_DIAG_GETSOCK_MAX)
		return;

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	mutex_lock(&inet_diag_table_mutex);
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	inet_diag_table[type] = NULL;
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	mutex_unlock(&inet_diag_table_mutex);
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}
EXPORT_SYMBOL_GPL(inet_diag_unregister);

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static int __init inet_diag_init(void)
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{
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	const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
					  sizeof(struct inet_diag_handler *));
	int err = -ENOMEM;

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	inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
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	if (!inet_diag_table)
		goto out;

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	idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
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					inet_diag_rcv, NULL, THIS_MODULE);
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	if (idiagnl == NULL)
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		goto out_free_table;
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	err = 0;
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out:
	return err;
out_free_table:
	kfree(inet_diag_table);
	goto out;
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}

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static void __exit inet_diag_exit(void)
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{
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	netlink_kernel_release(idiagnl);
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	kfree(inet_diag_table);
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}

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module_init(inet_diag_init);
module_exit(inet_diag_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);